JPS59191244A - Image magnification device - Google Patents

Abstract

PURPOSE:To obtain a device able to form a desired image part in the center of a phosphor screen while enabling an object image to be electrooptically magnified and observed and to change magnification by providing a specific image magnification tube, optical means, magnification input means and focusing current generation circuit respectively. CONSTITUTION:A photoelectric screen 7 is formed on the first base of a cylindrical airtight container and a phosphor screen 8 is formed on the second base facing the first base while providing an optical lens 6 forming an image of a subject on the photoscreen 7. Further, the first-and second focusing coils 11 and 12 are arranged on the periphery of the cylindrical airtight container for composing an image magnification tube 4 while providing an electric field generating means 16 which accelerates electrons generated on the photoelectric screen 7 in the direction of the phosphor screen 8. Said image magnification tube 4, an optical means forming a subject image on said photoelectric screen 7, a magnification input means and a focusing current generating circuit 13 supplying a current between the first-and-second focusing coils 11 and 12 while holding a fixed relation, which does not change an image formation position in said magnification, are provided for constituting an image magnification device.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Application of the Invention) The present invention relates to an image magnifying device for electro-optically magnifying and observing an object image.

(Description of Prior Art) It is well known that objects can be observed under magnification using optical magnifying devices such as microscopes and telescopes. In these devices, the magnification can be changed by changing the objective or eyepiece. Some telescopes use a zoom lens, and by moving the variable magnification lens, the focal length and magnification can be changed continuously.

(Detailed Description of the Invention) A first object of the present invention is to provide an image magnifying device capable of electro-optically magnifying and observing an object image.

A second object of the present invention is to provide an image magnifying device capable of electro-optically magnifying and observing an object image, which can change the magnification ratio and form a desired part of the image at the center of the fluorescent surface. An object of the present invention is to provide an enlargement device.

(Detailed Description of the Invention) In order to achieve the first object, an image magnifying device according to the present invention includes a cylindrical airtight container, a photocathode formed on a first bottom surface of the container, and a photocathode facing the first bottom surface. a fluorescent surface formed on a second bottom surface of the photocathode; an optical lens that forms an image of a subject on the photocathode; first and second focusing coils disposed around the outer periphery of the cylindrical airtight container; an electric field generating means for accelerating the electrons in the direction of the fluorescent surface, an image magnifying tube comprising the first and second focusing coils, an optical means for forming a subject image on the photocathode of the image magnifying tube, and a magnification ratio. The image forming apparatus is comprised of an input means and a focusing current generating circuit that supplies a current between the first and second focusing coils while maintaining a constant relationship between the currents of the first and second focusing coils without changing the imaging position at the magnification.

Further, in order to achieve the second object, a deflection device for deflecting the electrons generated by the photocathode, and a deflection device disposed outside the image magnifying tube to determine the center of expansion of the image magnifying tube are provided. a deflection circuit that supplies a signal for deflecting the electron beam in the image magnifying tube to the deflection device according to a signal from the magnification center manual means and a signal indicating the magnification rate from the magnification rate input means; The apparatus is configured to supply a deflection signal to the deflection device of the image magnifying tube to form a desired portion of the magnified image at the center of the phosphor surface, taking into account the rotation of the image magnifying tube.

(Description of Embodiments) The image magnifying device according to the present invention will be described in more detail below with reference to the drawings and the like.

FIG. 1 is a block diagram showing an embodiment of an image magnifying tube used in an image magnifying device according to the present invention.

The glass container forming the main body of the image magnifying device has a diameter of 50 m.
It is a cylindrical container with a length of 300 mm. A highly sensitive photocathode 7 called 5-20 is formed on the inner surface of the first bottom surface of the glass airtight container.

In order to project a real image of the object to be observed onto the photocathode 7, the focal length is 1.
A 6.7 mm optical lens 6 is placed 150 mm in front of the photocathode 7.
It is provided at the location. This lens 6 has its principal point 1
An object to be observed placed at a distance of 8.8 mm is magnified 8.0 times and projected onto the photocathode.

A mesh electrode 9 is disposed inside the container so as to face the photocathode 7 . A cylindrical electrode 10 is provided on the inner peripheral surface of the container.

The mesh electrode 9 is arranged parallel to the photocathode 7 with an interval of 5 mm. 'The cylindrical electrode 10 is an inner wall of the cylindrical side of the airtight container, and a thin film of aluminum is formed on the portion between the mesh electrode 9 and the fluorescent surface 8. The fluorescent surface 8 is
It is formed by applying a phosphor called P-11 to the inner wall of the second bottom surface of the glass airtight container.

Further, the electric field generating means 16 applies the following potentials to each electrode, etc., and accelerates the electrons generated by the photocathode 7 in the direction of the fluorescent surface 8.

The photocathode 7 has a voltage of -7 KV and the fluorescent surface 8. The mesh electrode 9° cylindrical electrode 10 is given an OV.

A first and a second focusing coil 11.12 are arranged around the outer periphery of the cylindrical airtight container. First focusing coil 11
is arranged on the outside of the airtight container near the fluorescent surface 8 by 20 mm from the photocathode 7, and the second focusing coil 12 is arranged on the outside of the airtight container near the fluorescent surface 8 by 150 mm from the photocathode 7. .

In the above configuration, each focusing coil includes a focusing current generator circuit 1.
3, the magnification of the image formed on the fluorescent surface 8 can be changed without moving the imaging surface by supplying a current having the constant relationship shown in FIG.

FIG. 2 is a graph showing the relationship between the current of the first and second focusing coils of the magnifying device and the magnification ratio.

From FIG. 2, it can be seen that when a current of 70 mA is passed through the second focusing coil without passing current through the first focusing coil 11, the magnification of the image is 1.

Similarly, if a current of 150 mA is passed through the first focusing coil 11 and 700 mA is passed through the second focusing coil, the magnification of the image will be doubled.

When a current of 10105 O is passed through the first focusing coil 11 and a current of 100 mA is passed through the second focusing coil, the magnification of the image becomes 5 times.

When a current of 1200 mA is passed through the first focusing coil 11 and a current of 46 mA is passed through the second focusing coil, the magnification of the image becomes 5 times.

When the current of the first focusing coil is set to 1300 mAX and the current of the second focusing coil is set to OmA, the image magnification is
The magnification can be continuously changed electro-optically between '-10 times.

Therefore, in combination with the optical magnification, the subject can be magnified between 8 and 80 times. Two pairs of deflection coils 14 for deflecting the electrons are further provided on the outer periphery of the cylindrical airtight container. By supplying a current of 0 to 500 mA to the two pairs of coils, photoelectrons emitted from any point on the photocathode 7 can be made to enter any point on the fluorescent surface 8.

A deflection current power source 15 supplies current to the two pairs of coils to obtain a desired deflection.

Next, the configuration of the operating device used in the image magnifying device according to the present invention will be explained with reference to FIG.

In FIG. 3, the same parts as in FIG. 1 are given the same numbers, and their explanation will be omitted.

The manual input device 17 is an input device for inputting a desired magnification (M) and a center (P) of an image to be magnified and formed on the fluorescent surface (hereinafter referred to as "center of magnification"). The center (P) of the image on the fluorescent surface is set in advance at a predetermined magnification M (usually 1
), an image is formed so that the image projected onto the center of the photocathode is at the center of the phosphor surface, and the coordinates of the image on the phosphor surface are specified.

When you key in the magnification rate and the center of magnification, the output terminal 17
1 outputs a signal representing the magnification rate (M), and output terminal 1
72 outputs a signal representing the center of expansion (P).

Data related to the magnification rate inputted by the manual input device 17 is connected to the magnification rate signal conversion circuit 18 . This circuit 18 outputs from an output terminal 181 a signal corresponding to the horizontal axis coordinate (current of the first focusing coil) at each point of the magnification rate M as shown in FIG. 2 for a specified magnification rate. ,
A signal corresponding to the vertical axis coordinate (current of the second focusing coil) is sent out from the output terminal 182.

The focusing coil power source 13 sends a first focusing coil current and a second focusing coil current to each coil according to a signal from the magnification factor signal conversion circuit 18.

This focusing coil current magnifies the electron image on the photocathode to a specified magnification (M) on the fluorescent surface.

A magnification signal and a position signal are connected to the deflection signal generating circuit 1'9.

The deflection signal generating circuit 19 sends out a deflection coil current for deflecting the image so that the center point P of the magnification of the image magnified by M times becomes the center of the fluorescent surface.

FIG. 4 shows an embodiment of the deflection signal generating circuit.

When a current is passed through the focusing coil to obtain the desired magnification, the current causes the electron image on the photocathode to be magnified onto the phosphor surface, but rotated about its center. This angle is called the rotation angle.

There is a certain relationship between magnification and rotation angle.

This rotation angle becomes a problem when determining the center of expansion.

Normally, when an arbitrary point on the fluorescent surface is designated and enlarged when the electro-optical magnification is 1, the enlarged image rotates in accordance with the magnification and the angle of the image blurs with the previous screen.

FIG. 5 is a graph showing the relationship between magnification and rotation angle.

The function conversion circuit 192 of the deflection signal generation circuit 19 is a circuit that converts an enlargement ratio into a rotation angle.

Note that the scale on the vertical axis in FIG. 6 indicates the difference from the rotation angle when M=1. Arithmetic circuit 19 of deflection signal generation circuit 19
3 is the magnification M2 rotation angle θ and P (the coordinates of P with the center of the fluorescent surface as the origin are (Xo + y O)), x1 = M (XO cos θ - yosin θ) y1 = M
Perform the calculation (x6 sinθ+yocosθ), and x
This is an arithmetic circuit that outputs l and yl.

Point QCX1. expressed by coordinates (X+,)'+). y1) is the point at which point P moves on the fluorescent surface when a current is passed through the focusing coil for obtaining magnification M.

Furthermore, the deflection direction is determined by the composite magnetic field of the deflection magnetic field and the component of the focusing magnetic field perpendicular to the tube axis. Furthermore, in order to change the magnification M, the focusing magnetic field is changed.

Taking these into account, there is a directional deviation (
difference) occurs.

It is understood that this difference depends on the magnification rate M.

When the magnification ratio M=1, the component of the focused magnetic field perpendicular to the tube axis is zero.

FIG. 7 shows the relationship between the deviation in the deflection direction and the magnification ratio.

The magnification rate two-rotation angle conversion circuit 194 is a function conversion circuit that converts the magnification rate into an angle of deviation α in the deflection direction.

A circuit 195 calculates the deviation α in the deflection direction and the Q(x+,
yl) and enter X 2 =X I CO3α+y1sinαy2°−x
The calculation 1sinα+ylcosα is performed, and a corrected temporary point Q' (X2. y2) is output, which is taken into consideration when deflecting the Q(X+, y+) point to the origin, which is the center of the fluorescent surface.

The deflection sensitivity correction circuit 196 is a circuit for correcting deflection sensitivity. The deflection sensitivity changes depending on the magnification M as shown in FIG.

The circuit 196 outputs the deflection sensitivity by increasing the magnification factor M4.

The arithmetic circuit 197 calculates the deflection sensitivity and the point Q (X2
．． This is an arithmetic circuit that calculates 1x=x2/D iy=y2/D from the coordinates of )'2) and outputs ix and iy.

ix, iy are the deflection currents required to move the point Q Cx1 r yl) to the center of the fluorescent surface.

1) (is the drive power source 15X for the deflection coil that deflects in the X direction.
, and iy is connected to a drive power source 15Y for a coil deflecting in the y direction.

Using these circuits, the deflection signal generating circuit 19 controls the deflection coil current so that the desired portion of the image magnified by M times becomes the center of the fluorescent surface.

Since the device according to the present invention is configured as described above,
First, an entire image of the object is formed on the fluorescent surface at an electro-optical magnification of 1, and the magnification is input using the magnification input means.
A desired enlarged image can be obtained.

Further, since it includes a deflection device and a deflection signal generating circuit to which a signal from the enlargement center input means and a signal indicating the enlargement rate from the enlargement rate input means are connected, the rotation of the image that changes depending on the enlargement rate is taken into account. A desired portion of the enlarged image can be formed at the center of the fluorescent surface.

Various modifications can be made to the embodiments described in detail above within the scope of the present invention.

For example, the deflection signal generation circuit 19 may prepare a digital correction table corresponding to the magnification and position and perform digital correction.

(Detailed Description of the Invention) As described in detail above, according to the present invention, it has become possible to enlarge an object image electro-optically.

It is now possible to obtain an enlarged image with a roughly desired portion formed at the center of the fluorescent surface.

We can expect new applications that are different from conventional optical magnification observation.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of an image magnifying device according to the present invention, and FIG. 2 is a graph showing the relationship between the current of the first and second focusing coils of the magnifying device and the magnification ratio. FIG. 3 is a block diagram showing an embodiment of the magnifying observation system according to the present invention. FIG. 4 is a block diagram showing an embodiment of the deflection signal generating circuit. FIG. 5 is a graph showing the relationship between magnification and rotation angle. FIG. 6 is a graph showing the relationship between magnification and angle of deflection direction. FIG. 7 is a graph showing the relationship between magnification and deflection sensitivity. 6... Optical lens 7... Photocathode 8...
Fluorescent surface 9...Mesh electrode 10...Cylindrical electrode 11...First focusing coil 12...Second focusing coil 13...Power source 16 for the focusing coil...Electric field generating means 17...Manual input device 18...Magnification rate signal conversion circuit 19...Deflection signal generation circuit Patent applicant Hamamatsu Photonics Co., Ltd. Agent Patent attorney Hisashi Inoro Figure 3.2 □ First focused snow t ( ”A) Figure 3 Figure 4 Figure 5 Opening A? O 6 Figure 5i-7 □ Expanded Expedited Procedures Amendment 1, Indication of Case 1988 Patent Application No. 66769 2, Invention Title Image Enlargement Device 3. Relationship with the case of the person making the amendment Patent applicant 4, agent 6, ?li positive subject

Claims (2)

[Claims] (1) A cylindrical airtight container, a photocathode formed on a first bottom surface of the container, a fluorescent surface formed on a second bottom surface opposite to the first bottom surface, and an image of a subject on the photocathode in front. an optical lens to be formed; first and second focusing coils disposed around the outer periphery of the cylindrical airtight container; electric field generating means for accelerating electrons generated by the photocathode toward the fluorescent surface; an image magnifying tube consisting of a focusing coil, an optical means for forming a subject image on a photocathode of the image magnifying tube, a magnifying power manual means, and a coupling between the currents of the first and second focusing coils at the magnifying factor. An image magnifying device consisting of a focused current generation circuit that supplies current while maintaining a constant relationship that does not change the image position. (2) A cylindrical airtight container, a photocathode formed on a first bottom surface of the container, a fluorescent surface formed on a second bottom surface opposite to the first bottom surface, and an image of a subject is formed on the photocathode. first and second focusing coils disposed around the outer periphery of the cylindrical airtight container; electric field generating means for accelerating electrons generated by the photocathode toward the fluorescent surface; and electrons generated by the photocathode. an image magnifying tube comprising the first and second focusing coils, an optical means for forming a subject image on a photocathode of the image magnifying tube, a magnification input means, and the first and second focusing coils. a focusing current generating circuit that supplies a current between the focusing coils while maintaining a constant relationship that does not change the imaging position at the magnification ratio; and an enlargement center position input means;
A signal from the magnification center input means and a signal indicating the magnification rate from the magnification rate input means are connected, and a desired part of the magnified image is centered on the fluorescent surface by taking into account the rotation of the image that changes depending on the magnification rate. An image magnifying device comprising a deflection signal generating circuit that supplies a deflection signal to be formed to a deflection device of the image magnifying tube.